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MC74HC646

Motorola
Part Number MC74HC646
Manufacturer Motorola
Description Octal 3-State Bus Transeceivers and D Flip-Flops
Published Sep 11, 2005
Detailed Description MOTOROLA SEMICONDUCTOR TECHNICAL DATA Octal 3-State Bus Transceivers and D Flip-Flops High–Performance Silicon–Gate CM...
Datasheet PDF File MC74HC646 PDF File

MC74HC646
MC74HC646

Overview
MOTOROLA SEMICONDUCTOR TECHNICAL DATA Octal 3-State Bus Transceivers and D Flip-Flops High–Performance Silicon–Gate CMOS The MC54/74HC646 is identical in pinout to the LS646.
The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs.
These devices are bus transceivers with D flip–flops.
Depending on the status of the Data–Source Selection pins, data may be routed to the outputs either from the flip–flops or transmitted real–time from the inputs (see Function Table and Application Information).
The Output Enable and the Direction pins control the transceiver’s function.
Bus A and Bus B cannot be routed as outputs to each other simultaneously, but can be routed as inputs to the A and B flip–flops.
Also, the A and B flip–flops can be routed as outputs to Bus A and Bus B.
Additionally, when either or both of the ports are in the high–impedance state, these I/O pins may be used as inputs to the D flip–flops for data storage.
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